Edge-to-edge media photo wall. Composed (placeholder children), curated (Treelist), or search-driven. Variants: Mosaic (dense span grid, overlay captions), Collage (loose CSS-masonry wall), and Arc (decorative photo arch fanned around an optionally centered heading + pill CTA). Optional Lightbox param opens Mosaic/Collage tiles in a modal detail view with social post metadata and prev/next paging.

• src/components/registry/components/cards-and-lists/media-wall.tsx→components/registry/components/cards-and-lists/media-wall.tsx
• src/components/registry/components/cards-and-lists/media-wall.recipe.ts→src/recipes/media-wall.recipe.ts
• src/components/registry/components/cards-and-lists/media-wall.sitecore.ts→components/registry/components/cards-and-lists/media-wall.sitecore.ts
• src/components/registry/blocks/chat.types.ts→components/registry/blocks/chat.types.ts
• src/components/registry/blocks/index.ts→components/registry/blocks/index.ts
• src/components/registry/blocks/mock-data.ts→components/registry/blocks/mock-data.ts
• src/components/registry/blocks/types.ts→components/registry/blocks/types.ts
• src/components/registry/components/cards-and-lists/_grid-classname.ts→components/registry/components/cards-and-lists/_grid-classname.ts